Hanger-board for series arc-lamps.



No. 686,312. Patented Nuv. I2, I90]. E. 0. LUNDIN.

HANGER BOARD FOR SERIES ARC LAMPS.

(Application filed June 10, 1901.) Modem ,2 Sheets-Sheet I.

N0 686,3I2. Patented NOV. l2, I90l.

E. 0. LUNDIN.

HANGER BOARD FOR SERIES ARC LAMPS.

(Application filed June 10, 1901.)

2 Sheets-Sheet 2..

(No Model.)

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UNITED STATES PATENT OFFICE.

EMIL O. LUNDIN, OF BOSTON, MASSACHUSETTS.

HANGER-BOARD FOR SERIES ARC-LAMPS.

SPECIFICATION forming part of Letters Patent No. 686,312, dated November 12, 1901.

Application filed June 10,1901. Serial No. 63,882. (No model.)

To aZZ whom, it may concern:

Be it known that I, EMIL O. LUNDIN, a citizen of the United States, and a resident of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Hanger- Boards for Series Arc-Lamps, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention has for its object the production of a novel and highly-efficient hangerboard or suspending device particularly adapted for series arc-lamps, whereby a very high insulation is attained, moisture and dust proof protection provided for the switch or cut-out mechanism,and perfect safety in trimming the lamp is secured.

Various novel features of my invention will be hereinafter described, and particularly pointed out in the following claims.

. Figure 1 is a side elevation of a hangerboard embodying one form of my invention shown in operative position secured to a protective bell, the latter being illustrated in section and only the upper portion of a lamp being shown suspended from the hangerboard. Fig. 2 is an enlarged underside View of the hanger-board detached. Fig. 3 is a perspective view of the cover-plate, to be described, and the switch-actuator supported thereby. Fig. 4 is an enlarged perspective view of the switch-actuator, the cover-plate being indicated by dotted lines. Fig. 5 is an enlarged detail showing the manner in which the switch-actuator is operatively sustained by the cover-plate. Fig. 6 is an enlarged under side view of the base member of the hangerboard, the cover-plate and switch-actuator being omitted. Fig. 7 is a transverse sectional view thereof on the line a; at, Fig. 6; and Fig. 8 is an enlarged side elevation of the locking-hook for supporting the lamp.

The supporting device for arc-lamps is tech nically termed a hanger-board, and various structures have been devised for the purpose; but so far as I am aware they are open to objection, particularly when used for outdoor work.

The hanger-board should possess high insulation. It should be moisture and dust proof to prevent improper operation or short-circuiting of the switch or cut-out device, and it should be so constructed that the lamp can be trimmed with safety to the trimmer. In my present invention I have devised a hangerboard which successfully fulfils all of the above requirements, the whole apparatus being strong, simple, and durable, as well as highly efficient.

The hanger-board comprises, essentially, a base, ofinsulating material, containing an in verted chamber and a detachable cover-plate to close the open lower end of the chamber, and, referring to the drawings, I have shown the base as consisting of a thick circular base proper or bottom Z), of porcelain, earthenware, or other insulating material, provided with a circular and quite deep wall or flange b to form a chamber B. The bottom 1) projects beyond the said wall or flange and is provided with perforated bosses b to receive the screws 5, by which the hanger-board as a whole is secured in place (see Figs. 1 and 2) in such manner that the chamber B is inverted, Figs. 1 and7, when in operative position. The supporting-screws s are thus wholly exterior to and insulated from the chamber and its contents by the material of the base.

A socket U (see Fig. 7) is made in the top of the chamber for a purpose to be described, and within the latter lamp-terminals L L, having suitable binding-posts 2 for the wires I. L leading to the lamp, are rigidly secured to the top of the chamber in any well-known manner. Line-terminals M M are also secured to the top of the chamber, said terminals being electrically connected by leaders m m (see dotted lines, Fig. 6) with bindingposts M M, secured to the under face of the base proper, b, outside of the wall I), the line-wires M M Fig. 1, being connected with said binding-posts. The leaders m m are embedded in recesses in the upper face of the base proper and thoroughly covered with insulating material. Referring to Fig. 6, it will be seen that the inner faces of the several terminals are made concave or segmental and constitute arcs of the same circle, which latter is struck from the center of the socket b to cooperate with metallic spring switch mem bers or contacts S S, which are mounted on the periphery of a spool S of insulating material. (See Fig. 6.) This spool rests against the top of the chamber B, and I prefer to interpose a suitable annular washer s between the top of the spool and the countersunk lower end of the socket b to reduce friction. When the switch is in the position shown in Fig. 6, the lamp will be in circuit; but if rotated in the direction of the arrow 6 the contact members S S will be reversed as to their position, positively and completely cutting out the lamp. It will be manifest from the foregoing that the contents of the chamber 13 will not only be completely insulated from external objects by the thick base proper, b, and the annular wall I), but that any moisture or dust could only enter from the lower end of the chamber, and if this is tightly closed the chamber will be absolutely moisture and dust tight. Such closure is effected by a disk-like cover-plate P, which is preferably made of metal and which fits into a seat 19 in the lower end of the flange or wall I), an annular socket if being preferably made in the seat to receive a gasket P the shoulder 19 projecting downward to embrace the circumference of the cover-plate and aiding in making the joint tight. Screw-bolts 8 are passed through holes 9 in the cover-plate into holes 10 made in the wall (9, Fig. 6. Porcelain or other spoolsp of insulating material, are extended through holes in and supported by the cover-plate to receive the insulated wires L L of the lamp-circuit, the saidinsulatingwires fitting snugly into the spools.

Referring now to Figs. 3, 4, and 5,the coverplate has a central holep countersunk at its upper end, as at p, and the switch-actuator, comprising a spindle having a cam thereon and an attached lateral extension, is mounted on and supported by the cover-plate. The spindle consists of a squared or other polygonal portion 6?, reduced at its upper end and made cylindrical at d and having at its other end a laterally-extended double cam d preferably provided with an overhang CF. The length of the cam is such that it will easily enter and be rotatable in the countersunk portion 19 of the cover-plate, so that the latter will support the spindle, the part 61 passing through a correspondingly-shaped hole 8 in the spool S of the switch, while the tip (1 of the spindle enters the socket 11 Below the cam the spindle is cylindrical, as at dflto just easily fit the aperture 13 Without binding, and

a bent or lateral extension d preferably integral with the spindle, forms a continuation thereof on the other side of the cover-plate. Suitable leaf-springs S embrace the cam d (see Fig. 3,) and they are held at their ends in split cars 13 on the inner face of the coverplate to snap the switch actuator or spin dle, the overhang d preventing the springs from jumping up out of place. Now when the cover-plate is in position the spindle will be upright (see Fig. 3) and extended through the spool S to rotate it, and thereby actuate the switch, and the spindle, cam, and springs S will all be within the chamber B and protected thoroughly from moisture or dust, while from the exterior the only part exposed or visible will be the extension or handle (1 beneath the lower face of the cover-plate. It is impossible to take the actuator out unless the cover-plate is first removed from the base, and then the spindle and extension are tipped relatively to the cover-plate after detaching the springs S and the extension (1 can be drawn through the aperture 19 from the upper face of the cover-plate. Manifestly the switch-actuator cannot be withdrawn accidentally, for the cover-plate looks it in position so long as said plate is itself in place on the base. A handpiece d of insulating material, is preferably secured to the end of the extension CF, and stops p on the outer face of the cover-plate limit the throw of the switch actuator.

Between two earsp on the outer face of the cover-plate I have secured by a pin 15 the shank h of a depending upturned hook 7%, said ears being offset from the center of the plate, the hook-shank being long enough to prevent interference with the switch-handle by the hook, from which latter the lamp is suspended, the ring or eye H at the top of the .lamp-frame H receiving the hook 721 Fig. 1.

I have provided a lock for the hook to prevent accident-al disengagement of the lamp, and herein I have shown the locking device as a bent bail 71 with a loop 72.3 at its outer end to receive the point of the hook and engage a socket h, made in the point of the hook, the other end of the bail being flattened to rest against the flat side of the hookshank. An elongated slot Win the flattened end of the bail receives a clamp or looking screw h which is screwed into the hookshank, and when the hook is to be locked the bail is moved into full-line position,'Fig. 8, and the screw 7L5 tightened. The opening of the hook is then closed and cannot be opened until the screw is loosened and the bail moved into dotted-line position.

In Fig. 1 I have shown the hanger-board secured to the top of a bell A, within the same, by the supporting-screws s, the bell being made of metal and completely shielding the hanger-board from rain or snow. Oppositelyextended lateral arms A, projecting exter nally from near the top of the bell, support insulators A for the line-wires M M, as clearly shown in Fig. 1, said wires leading therefrom to the binding-posts M M re spectively, and a ring or eye A secured to the top of the bell, receives a hook or other device A by which the whole apparatus is suspended.

My invention is not restricted to the construction and arrangement herein shown, as the same maybe varied or modified in different particulars without departing from the spirit and scope of my invention.

The hanger-board may be used in connection with other electrical apparatus, as well as with arc-lamps-as, for instance, an insulator could be suspended from the coverplate, the latter being secured to the base, as described.

I prefer to make the laterally-extended arms of the bell as an integral part thereof, as the structure is thereby greatly simplified and the strength increased with com paratively light weight.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. In a device of the class described, a base of insulating material having a depending annular flange to form a chamber open at its lower end, circuit-terminals and a cooperating switch mounted on the base within the chamber, a detachable cover-plate to seat on the lower end of the flange and having an aperture, and a switchactuator consisting of a spindle to engage the switch and having a laterally-bent extension to form a hand piece,

the extension being passed through the aperture of the cover-plate from its upper side, said cover-plate when in operative position supporting the switch-actuaton 2. In a device of the class described, a base of insulating material having an inverted chamber therein, the lower ends of the wall thereof having a seat, terminals and a coopcrating movable switch member within the chamber, a detachable cover-plate to rest on the seat and close the chamber, and having an aperture, a spindle having a cam and adapted to engage and rotate the switch member, said spindle being supported by the cover-plate and having a bent extension at its lower end passed through the aperture in and forming a handpiece below the coverplate, and a switch-spring in engagement with the cam and connected with the cover-plate.

3. In a device of the class described, a base of insulating material having an inverted chamber therein, terminals and a cooperating switch member within the chamber, a detachable cover-plate to tightly close the lower end of the chamber, and having an aperture therein, and an actuating spindle for the switch member, having an integral, laterallybent extension at its lower end, said extension being passed through the aperture from the upper side of the cover-plate, the latter supporting the spindle within the chamber.

4. In a device of the class described, a base of insulating material chambered to contain the terminals and a cooperating switch, a cover-plate for the chamber, a depending upturned lamp-supporting hook on said coverplate, and a lock mounted on the shank of the hook and adapted to engage the tip thereof, to close the hook.

5. In a device of the class described, a chambered base of insulating material, a coverplate therefor, to close the lower end of the chamber, an upturned lamp-supporting hook depending from the cover-plate, a lockingbail to engage the point of the hook and having a slot, and a clamping-screw extended into the hook-shank through the slot, to hold the bail in looking position.

6. In a device of the class described, a base of insulating material having an inverted chamber therein, having a socket in its top, line and lamp circuit terminals on the base within the chamber, an apertured, detachable cover-plate for the lower end of the chamber, a switch-spindle supported by the cover-plate and having a laterally-bent e3:- tension passed through the aperture in the cover-plate, the extension constituting a handle for the switch, the upper end of the spindle being seated in the socket in the top of the chamber, and a switch to cooperate with the terminals, mounted on and insulated from the spindle within the chamber.

7. A suspending device for series arelamps, comprising a'bell having laterally-extended insulator arms for the line-wires, a base of insulating material secured to the in terior of the bell and having an inverted chamber, a cover-plate to close the lower end of the chamber, terminals and a cooperating switch within the latter, a switch-actuator supported by said cover-plate and having a lateral extension extended therethrough to constitute an external handle, a lamp-hook depending from the cover-plate, insulatingspools mountedin the latter, to lead the lamp circuit into the terminals therefor within the chamber and externally-accessible bindingposts on the base for the line-wires, in electrical connection with the corresponding terminals within the chamben 8. In a suspending device for arc-lamps, a metallic bell having a body provided with a wide mouth, and having lateral oppositelyextended insulator-arms integral with the body of the bell and projecting from the sides of the bell below the top and above the mouth thereof.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EMIL O. LU'NDIN.

\Vitnesses:

J can 0. EDWARDS, ELIZABETH R. MORRISON.

IIO 

